From 4ec51b386a9d4000295263cee221d37ac7d37b59 Mon Sep 17 00:00:00 2001
From: scrawl <scrawl@baseoftrash.de>
Date: Thu, 24 Jul 2014 19:00:57 +0200
Subject: [PATCH] Add ManualResourceLoader for fog of war textures (Fixes
 #1675)

---
 apps/openmw/mwrender/localmap.cpp | 28 +++++++++++++++++++++++++++-
 apps/openmw/mwrender/localmap.hpp |  5 ++++-
 2 files changed, 31 insertions(+), 2 deletions(-)

diff --git a/apps/openmw/mwrender/localmap.cpp b/apps/openmw/mwrender/localmap.cpp
index 62907fcc3..271cbbfe1 100644
--- a/apps/openmw/mwrender/localmap.cpp
+++ b/apps/openmw/mwrender/localmap.cpp
@@ -340,7 +340,9 @@ Ogre::TexturePtr LocalMap::createFogOfWarTexture(const std::string &texName)
                         sFogOfWarResolution, sFogOfWarResolution,
                         0,
                         PF_A8R8G8B8,
-                        TU_DYNAMIC_WRITE_ONLY);
+                        TU_DYNAMIC_WRITE_ONLY,
+                    this // ManualResourceLoader required if the texture contents are lost (due to lost devices nonsense that can occur with D3D)
+                    );
     }
 
     return tex;
@@ -457,6 +459,30 @@ bool LocalMap::isPositionExplored (float nX, float nY, int x, int y, bool interi
     return alpha < 200;
 }
 
+void LocalMap::loadResource(Ogre::Resource* resource)
+{
+    std::string resourceName = resource->getName();
+    size_t pos = resourceName.find("_fog");
+    if (pos != std::string::npos)
+        resourceName = resourceName.substr(0, pos);
+    if (mBuffers.find(resourceName) == mBuffers.end())
+    {
+        // create a buffer to use for dynamic operations
+        std::vector<uint32> buffer;
+
+        // initialize to (0, 0, 0, 1)
+        buffer.resize(sFogOfWarResolution*sFogOfWarResolution, 0xFF000000);
+        mBuffers[resourceName] = buffer;
+    }
+
+    std::vector<uint32>& buffer = mBuffers[resourceName];
+
+    Ogre::Texture* tex = dynamic_cast<Ogre::Texture*>(resource);
+    tex->createInternalResources();
+    memcpy(tex->getBuffer()->lock(HardwareBuffer::HBL_DISCARD), &buffer[0], sFogOfWarResolution*sFogOfWarResolution*4);
+    tex->getBuffer()->unlock();
+}
+
 void LocalMap::updatePlayer (const Ogre::Vector3& position, const Ogre::Quaternion& orientation)
 {
     if (sFogOfWarSkip != 0)
diff --git a/apps/openmw/mwrender/localmap.hpp b/apps/openmw/mwrender/localmap.hpp
index babf7224e..1572800e5 100644
--- a/apps/openmw/mwrender/localmap.hpp
+++ b/apps/openmw/mwrender/localmap.hpp
@@ -5,6 +5,7 @@
 
 #include <OgreAxisAlignedBox.h>
 #include <OgreColourValue.h>
+#include <OgreResource.h>
 
 namespace MWWorld
 {
@@ -23,12 +24,14 @@ namespace MWRender
     ///
     /// \brief Local map rendering
     ///
-    class LocalMap
+    class LocalMap : public Ogre::ManualResourceLoader
     {
     public:
         LocalMap(OEngine::Render::OgreRenderer*, MWRender::RenderingManager* rendering);
         ~LocalMap();
 
+        virtual void loadResource(Ogre::Resource* resource);
+
         /**
          * Clear all savegame-specific data (i.e. fog of war textures)
          */